White Mountains Insurance Group, Ltd. conducts its businesses through its property and casualty insurance and reinsurance subsidiaries and affiliates. It operates in OneBeacon, Sirius Group, HG Global/BAM and Other Operations. The OneBeacon segment consists of OneBeacon Insurance Group, Ltd., a company that owns a family of the United States-based property and casualty insurance companies. The Sirius Group segment consists of Sirius International Insurance Group, Ltd. and its subsidiaries. The HG Global/BAM segment consists of White Mountains� investment in HG Global Ltd. (HG Global) and the results of Build America Mutual Assurance Company (BAM). In April 2013, White Mountains Solutions Holding Company, Inc, a wholly owned subsidiary of the Company announced that it had completed the acquisition of American Fuji Fire and Marine Insurance Company.